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Table 4. Summary of Groundwater Extraction System Data, ARCO Station 2133, Stockton, California <br /> Start-up date 4/18/91 <br /> Date Total volume, Average Effluent concentration, 1 Net removal,lbs&gallons <br /> sampled Period extracted, allons flowrate,gpm TPH-G B TPH-G B <br /> 1l <br /> Totals and averages 4/18191-12/9/94 9,6401,032 53 740 60 550 lbs 48 lbs <br /> cumulative 89 gals 07 gals <br /> IV <br /> Sample calculations. <br /> Removal rate calculation <br /> IN removed—("x"gg/L)*(gram/1,000,IIµg)*(lb/454 grams)*(3 78 Ugal)*(gallons pumped) <br /> where"x"is influent concentration <br /> To calculate pounds removal for a reporting period if several sampling events occurred in one period,we used the effluent concentrations <br /> that had the highest TPH value <br /> Gallons removal calculation(forTPH) <br /> gallons removed lbs*gallon/6 2 I[s(density for TPH-G is 6 2,however,for Benzene it is 7 32) <br /> I <br />